Is Pitra Dosh the same as Kaal Sarp Dosh?

No, they are different astrological doshas, although both involve Rahu and Ketu. Pitra Dosh specifically relates to ancestral karma and afflictions to luminaries or the 9th house, while Kaal Sarp Dosh occurs when all planets are hemmed between Rahu and Ketu. Sometimes, both doshas can exist in a chart.